Draig-koss KPH30 Wireless Earpad Adapter

Draig-koss KPH30 Wireless Earpad Adapter

Installation Video

Watch the installation process here!

I've always loved modding Koss headphones! When the KPH30 Wireless came out, I knew I wanted to try and mod them. After I got them, I was pleasantly surprised by some features - particularly this nice big gap for pads to slot into. A lot of it was bigger, bulkier, more spaced out. It made modding without actually physically modifying the headphones that much easier.

So I wanted to try fitting full sized earpads onto it. Of course, these headphones have this sort of backwards pointing angle to them. So if you just try to put pads on them normally, they just won't fit right. So I opened up Onshape and developed this angled adapter that lets you use small to regular-sized over-the-ear earpads with your KPH30 Wireless.

I couldn't find a way to take the headphones apart yet, so I designed it with these little tabs that can flex and move - they let you stretch the adapter over the driver housing and slot it into place. While I was designing them, I found I really hated how they sounded closed off. And I did not want to go through the process of figuring out how to tune them like that. So I wanted to switch to open back and I got busy designing some holes in it. But then I remembered the oops, all infill, trick for gyroid infill. Air and sound can pass right through it, so I just used infil instead of designing holes. This also made them very open.

This dramatically improves comfort and since in theory your ear should be pretty close to the same spot, it should keep the same sound signature. Its sounded pretty good in my tests. Its not really going to improve the sound. But it will make them open. And honestly openback Bluetooth headphones are incredibly rare.

Compatible Earpads

Works great with:

• Yaxi pads (The bigger ones)
• Brainwavz
• Most Earpads

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Printing Instructions

MUST be printed in TPU with 0.4mm nozzle!

Layer Height: The thinner the more it helps with overhangs.
Infill: Gyroid for main model

Wall Settings (Important! to Remove Gap Infills)

• Turn on "Arachne" wall generation
• Minimum wall width: 85% (leave default)
• Minimum feature size: 0% (removes gap fill)

Quality Settings

• "Scarf around the entire wall": ENABLED (reduces blobbing/stringing)
• "Slow down for overhangs": DISABLED (prevents drooping)

Supports

• Auto and snug, 20 degree threshold
• Top Z Distance: 0.22mm or higher (difference between pulling off supports vs cutting them off)

Critical: Multi-Part Setup

The STL is a single file containing 2 parts:

1. Import the STL into your slicer and split to parts (not objects)
2. Find the smaller part and right-click it and "convert part to" "modifier"
3. Select the modifier and switch to "Per Object" view
4. Change modifier settings:
   • Wall loops: 0 (no walls)
   • Top/bottom shells: 0 layers
   • Sparse infill: 30% Gyroid

The gyroid modifier creates openings that allow sound to pass through or be absorbed instead of being reflected. You can tune the sound by using tape or stickers to block openings from the outside!